On 03/21/14 10:32, Ian Campbell wrote:
On Thu, 2014-03-20 at 15:06 -0400, Don Slutz wrote:
-b <bytes>, --bytes-per-line <bytes>
change the number of bytes per line output for
Stack.
(default 32) Note: rounded to native size (4
or 8 bytes).
I can just about see a use for this.
This is much more useful when used with --decode-as-ascii or when you
have a wide "terminal".
-l <lines>, --lines <lines>
change the number of lines output for Stack.
(default 5)
Can be specified as MAX. Note: Fewer lines
will be output
if Stack limit reached.
What is this useful for which "less", "head" or "tail" can't achieve?
By default only part of the stack is dumped:
tools/xentrace/xenctx -s ~/zzm 4 -n 2
rip: ffffffff81346876 io_serial_in+0x16
flags: 00000002 nz
rsp: ffff8800385a5ab8
rax: 000000000000006f rcx: 0000000000000000 rdx: 00000000000003fd
rbx: ffffffff81ff8f00 rsi: 0000000000000005 rdi: ffffffff81ff8f00
rbp: ffff8800385a5ab8 r8: ffffffff81c03a10 r9: 0000000000000080
r10: 0000000000000005 r11: 0000000000000046 r12: 000000000000270f
r13: 0000000000000020 r14: 0000000000000025 r15: ffffffff81346f20
cs: 0010 ss: 0018 ds: 0000 es: 0000
fs: 0000 @ 00007f07972f3700
gs: 0000 @ ffff88000b400000/0000000000000000/
Code (instr addr ffffffff81346876)
48 89 e5 0f 1f 44 00 00 0f b6 4f 41 0f b7 57 08 d3 e6 01 f2 ec <0f> b6
c0 c9 c3 0f 1f 44 00 00 55
Stack:
ffff8800385a5ae8 ffffffff81346e64 ffffffff81ff8f00 0000000000000072
0000000000000064 0000000000000025 ffff8800385a5b08 ffffffff81346f46
ffffffff81e3e430 ffffffff81ff8f00 ffff8800385a5b48 ffffffff813428de
ffffffff8100bc0e 0000000000000000 ffffffff81ff8f00 0000000000000001
0000000000000064 ffffffff81e3e40c ffff8800385a5b98 ffffffff813472ad
Call Trace:
[<ffffffff81346876>] io_serial_in+0x16 <--
[<ffffffff81346e64>] wait_for_xmitr+0x24
[<ffffffff81346f46>] serial8250_console_putchar+0x26
[<ffffffff813428de>] uart_console_write+0x3e
[<ffffffff8100bc0e>] apic_timer_interrupt+0xe
[<ffffffff813472ad>] serial8250_console_write+0xbd
[<ffffffff8106b8f5>] __call_console_drivers+0x75
[<ffffffff8106b95a>] _call_console_drivers+0x4a
[<ffffffff8106be6e>] release_console_sem+0x4e
[<ffffffff8106c628>] vprintk+0x248
[<ffffffff814fd363>] printk+0x41
Here is the same data with a bigger -l (domU is paused):
tools/xentrace/xenctx -s ~/zzm 4 -n 2 -l 10
rip: ffffffff81346876 io_serial_in+0x16
flags: 00000002 nz
rsp: ffff8800385a5ab8
rax: 000000000000006f rcx: 0000000000000000 rdx: 00000000000003fd
rbx: ffffffff81ff8f00 rsi: 0000000000000005 rdi: ffffffff81ff8f00
rbp: ffff8800385a5ab8 r8: ffffffff81c03a10 r9: 0000000000000080
r10: 0000000000000005 r11: 0000000000000046 r12: 000000000000270f
r13: 0000000000000020 r14: 0000000000000025 r15: ffffffff81346f20
cs: 0010 ss: 0018 ds: 0000 es: 0000
fs: 0000 @ 00007f07972f3700
gs: 0000 @ ffff88000b400000/0000000000000000/
Code (instr addr ffffffff81346876)
48 89 e5 0f 1f 44 00 00 0f b6 4f 41 0f b7 57 08 d3 e6 01 f2 ec <0f> b6
c0 c9 c3 0f 1f 44 00 00 55
Stack:
ffff8800385a5ae8 ffffffff81346e64 ffffffff81ff8f00 0000000000000072
0000000000000064 0000000000000025 ffff8800385a5b08 ffffffff81346f46
ffffffff81e3e430 ffffffff81ff8f00 ffff8800385a5b48 ffffffff813428de
ffffffff8100bc0e 0000000000000000 ffffffff81ff8f00 0000000000000001
0000000000000064 ffffffff81e3e40c ffff8800385a5b98 ffffffff813472ad
00000000385a5cd8 0000000000000006 ffff8800385a5c08 ffffffff81affa00
ffffffff81c03800 000000000001696c 0000000000000064 0000000000000046
ffff8800385a5bc8 ffffffff8106b8f5 00000000000169d0 ffffffff81e2797c
00000000000169d0 00000000000169d0 ffff8800385a5be8 ffffffff8106b95a
206465697272616d 00000000fffff167 ffff8800385a5c28 ffffffff8106be6e
Call Trace:
[<ffffffff81346876>] io_serial_in+0x16 <--
[<ffffffff81346e64>] wait_for_xmitr+0x24
[<ffffffff81346f46>] serial8250_console_putchar+0x26
[<ffffffff813428de>] uart_console_write+0x3e
[<ffffffff8100bc0e>] apic_timer_interrupt+0xe
[<ffffffff813472ad>] serial8250_console_write+0xbd
[<ffffffff8106b8f5>] __call_console_drivers+0x75
[<ffffffff8106b95a>] _call_console_drivers+0x4a
[<ffffffff8106be6e>] release_console_sem+0x4e
[<ffffffff8106c628>] vprintk+0x248
[<ffffffff814fd363>] printk+0x41
"less", "head" or "tail" are unable to change xenctx, only control
what you see of xenctx's output.
In both cases though it seems to make the code more complicated for what
seems to be a not all that useful increase in functionality.
It is true that using the existing -S:
tools/xentrace/xenctx -s ~/zzm 4 -S
rip: ffffffff81346876 io_serial_in+0x16
flags: 00000002 nz
rsp: ffff8800385a5ab8
rax: 000000000000006f rcx: 0000000000000000 rdx: 00000000000003fd
rbx: ffffffff81ff8f00 rsi: 0000000000000005 rdi: ffffffff81ff8f00
rbp: ffff8800385a5ab8 r8: ffffffff81c03a10 r9: 0000000000000080
r10: 0000000000000005 r11: 0000000000000046 r12: 000000000000270f
r13: 0000000000000020 r14: 0000000000000025 r15: ffffffff81346f20
cs: 0010 ss: 0018 ds: 0000 es: 0000
fs: 0000 @ 00007f07972f3700
gs: 0000 @ ffff88000b400000/0000000000000000/
Code (instr addr ffffffff81346876)
48 89 e5 0f 1f 44 00 00 0f b6 4f 41 0f b7 57 08 d3 e6 01 f2 ec <0f> b6
c0 c9 c3 0f 1f 44 00 00 55
Stack:
ffff8800385a5ae8 ffffffff81346e64 ffffffff81ff8f00 0000000000000072
0000000000000064 0000000000000025 ffff8800385a5b08 ffffffff81346f46
ffffffff81e3e430 ffffffff81ff8f00 ffff8800385a5b48 ffffffff813428de
ffffffff8100bc0e 0000000000000000 ffffffff81ff8f00 0000000000000001
0000000000000064 ffffffff81e3e40c ffff8800385a5b98 ffffffff813472ad
Stack Trace:
* [<ffffffff81346876>] io_serial_in+0x16 <--
ffff8800385a5ae8
[<ffffffff81346e64>] wait_for_xmitr+0x24
ffffffff81ff8f00
0000000000000072
0000000000000064
0000000000000025
ffff8800385a5b08
[<ffffffff81346f46>] serial8250_console_putchar+0x26
ffffffff81e3e430
ffffffff81ff8f00
ffff8800385a5b48
[<ffffffff813428de>] uart_console_write+0x3e
[<ffffffff8100bc0e>] apic_timer_interrupt+0xe
0000000000000000
ffffffff81ff8f00
0000000000000001
0000000000000064
ffffffff81e3e40c
ffff8800385a5b98
[<ffffffff813472ad>] serial8250_console_write+0xbd
00000000385a5cd8
0000000000000006
ffff8800385a5c08
ffffffff81affa00
ffffffff81c03800
000000000001696c
0000000000000064
0000000000000046
ffff8800385a5bc8
[<ffffffff8106b8f5>] __call_console_drivers+0x75
00000000000169d0
ffffffff81e2797c
00000000000169d0
00000000000169d0
ffff8800385a5be8
[<ffffffff8106b95a>] _call_console_drivers+0x4a
206465697272616d
00000000fffff167
ffff8800385a5c28
[<ffffffff8106be6e>] release_console_sem+0x4e
ffff8800385a5c18
ffff8800385a5c6d
ffffffff81ea7b24
0000000000000064
ffff8800385a5c58
0000000000000034
ffff8800385a5cc8
[<ffffffff8106c628>] vprintk+0x248
ffff8800385a5c98
0000000000000246
7420666f00000000
ffff8800385a5ca8
ffff8800385a5c68
343931206e692072
7365727065722035
ffff8800385a5ca8
0000000000002710
0000000000002710
ffffffff81c03a10
00000000d863e02e
ffff8800385a5d28
ffff8800385a5d38
000000000000003b
00000000021b9010
00007f07972b1010
0000000000000003
ffff8800385a5d28
[<ffffffff814fd363>] printk+0x41
6874202c00000010
ffff8800385a5d38
ffff8800385a5cf8
656e696863616d20
616820796c6e6f20
ffff8800385a5d38
0000000000002710
0000000000002710
ffffffff81c03a10
0000000000000080
ffff8800385a5db8
ffffffffa00a919d
696261706163206e
6977202c7974696c
20612074756f6874
206c6172746e6563
742079726f6d656d
2065726f7473206f
736d6172676f7270
74616420646e6120
754a206e49202e61
2c3534393120656e
6f76206e686f4a20
6e616d75654e206e
000000007570206e
00000000d863e02e
ffff8800385a5dc8
000000000000003a
ffff8800385a5e48
ffffffffa00a91e8
2064656873696c62
2072657061702061
64656c7469746e65
2074737269462720
666f207466617264
726f706572206120
656874206f742074
2c27434156444520
6820657265687720
6e696c74756f2065
6565726874206465
6320636973616220
000000006f706d6f
00000000d863e02e
ffff8800385a5e58
0000000000000039
ffff8800385a5ed8
ffffffffa00a91e8
6f662073746e656e
726f747320612072
72676f72702d6465
75706d6f63206d61
293128203a726574
726f6d656d206120
6961746e6f632079
746f6220676e696e
6120617461642068
7274736e6920646e
3b736e6f69746375
6320612029322820
0000000075636c61
00000000d863e02e
ffff8800385a5ee8
0000000000000038
ffff8800385a5f68
ffffffffa00a91e8
7520676e6974616c
617061632074696e
7020666f20656c62
6e696d726f667265
612068746f622067
6974656d68746972
6f6c20646e612063
706f206c61636967
736e6f6974617265
20656874206e6f20
6e61202c61746164
2061202933282064
00000000746e6f63
00000000d863e02e
ffff8800385a5f78
0000000000000037
ffff8800385a5ff8
ffffffffa00a91e8
74696e75206c6f72
65746e69206f7420
6e69207465727072
6f69746375727473
65726f747320736e
6d656d206e692064
20646e612079726f
63656e20656b616d
6120797261737365
202e736e6f697463
2073692073696854
63206f7320656874
00000000656c6c61
00000000d863e02e
ffff8800385a6008
0000000000000036
ffff8800385a6088
And other tools, you can reformat this output into what -l gives.
It is not that each change makes a big difference, that happens when
several are used at one time:
tools/xentrace/xenctx -s ~/zzm 4 -l 200 -D -t -b 64
rip: ffffffff81346876 io_serial_in+0x16
flags: 00000002 nz
rsp: ffff8800385a5ab8
rax: 000000000000006f rcx: 0000000000000000 rdx: 00000000000003fd
rbx: ffffffff81ff8f00 rsi: 0000000000000005 rdi: ffffffff81ff8f00
rbp: ffff8800385a5ab8 r8: ffffffff81c03a10 r9: 0000000000000080
r10: 0000000000000005 r11: 0000000000000046 r12: 000000000000270f
r13: 0000000000000020 r14: 0000000000000025 r15: ffffffff81346f20
cs: 0010 ss: 0018 ds: 0000 es: 0000
fs: 0000 @ 00007f07972f3700
gs: 0000 @ ffff88000b400000/0000000000000000/
Code (instr addr ffffffff81346876)
48 89 e5 0f 1f 44 00 00 0f b6 4f 41 0f b7 57 08 d3 e6 01 f2 ec <0f> b6
c0 c9 c3 0f 1f 44 00 00 55
Stack:
ffff8800385a5ab8: ffff8800385a5ae8 ffffffff81346e64 ffffffff81ff8f00
0000000000000072 0000000000000064 0000000000000025 ffff8800385a5b08
ffffffff81346f46
.ZZ8....dn4.............r.......d.......%........[Z8....Fo4.....
ffff8800385a5af8: ffffffff81e3e430 ffffffff81ff8f00 ffff8800385a5b48
ffffffff813428de ffffffff8100bc0e 0000000000000000 ffffffff81ff8f00
0000000000000001
0...............H[Z8.....(4.....................................
ffff8800385a5b38: 0000000000000064 ffffffff81e3e40c ffff8800385a5b98
ffffffff813472ad 00000000385a5cd8 0000000000000006 ffff8800385a5c08
ffffffff81affa00
d................[Z8.....r4......\Z8.............\Z8............
ffff8800385a5b78: ffffffff81c03800 000000000001696c 0000000000000064
0000000000000046 ffff8800385a5bc8 ffffffff8106b8f5 00000000000169d0
ffffffff81e2797c
.8......li......d.......F........[Z8.............i......|y......
ffff8800385a5bb8: 00000000000169d0 00000000000169d0 ffff8800385a5be8
ffffffff8106b95a 206465697272616d 00000000fffff167 ffff8800385a5c28
ffffffff8106be6e .i.......i.......[Z8....Z.......married
g.......(\Z8....n.......
ffff8800385a5bf8: ffff8800385a5c18 ffff8800385a5c6d ffffffff81ea7b24
0000000000000064 ffff8800385a5c58 0000000000000034 ffff8800385a5cc8
ffffffff8106c628
.\Z8....m\Z8....${......d.......X\Z8....4........\Z8....(.......
ffff8800385a5c38: ffff8800385a5c98 0000000000000246 7420666f00000000
ffff8800385a5ca8 ffff8800385a5c68 343931206e692072 7365727065722035
ffff8800385a5ca8 .\Z8....F...........of t.\Z8....h\Z8....r in 1945
repres.\Z8....
ffff8800385a5c78: 0000000000002710 0000000000002710 ffffffff81c03a10
00000000d863e02e ffff8800385a5d28 ffff8800385a5d38 000000000000003b
00000000021b9010
.'.......'.......:........c.....(]Z8....8]Z8....;...............
ffff8800385a5cb8: 00007f07972b1010 0000000000000003 ffff8800385a5d28
ffffffff814fd363 6874202c00000010 ffff8800385a5d38 ffff8800385a5cf8
656e696863616d20 ..+.............(]Z8....c.O.........,
th8]Z8.....\Z8.... machine
ffff8800385a5cf8: 616820796c6e6f20 ffff8800385a5d38 0000000000002710
0000000000002710 ffffffff81c03a10 0000000000000080 ffff8800385a5db8
ffffffffa00a919d only
ha8]Z8.....'.......'.......:...............]Z8............
ffff8800385a5d38: 696261706163206e 6977202c7974696c 20612074756f6874
206c6172746e6563 742079726f6d656d 2065726f7473206f 736d6172676f7270
74616420646e6120 n capability, without a central memory to store
programs and dat
ffff8800385a5d78: 754a206e49202e61 2c3534393120656e 6f76206e686f4a20
6e616d75654e206e 000000007570206e 00000000d863e02e ffff8800385a5dc8
000000000000003a a. In June 1945, John von Neumann
pu......c......]Z8....:.......
ffff8800385a5db8: ffff8800385a5e48 ffffffffa00a91e8 2064656873696c62
2072657061702061 64656c7469746e65 2074737269462720 666f207466617264
726f706572206120 H^Z8............blished a paper entitled 'First draft
of a repor
ffff8800385a5df8: 656874206f742074 2c27434156444520 6820657265687720
6e696c74756f2065 6565726874206465 6320636973616220 000000006f706d6f
00000000d863e02e t to the EDVAC', where he outlined three basic
compo......c.....
ffff8800385a5e38: ffff8800385a5e58 0000000000000039 ffff8800385a5ed8
ffffffffa00a91e8 6f662073746e656e 726f747320612072 72676f72702d6465
75706d6f63206d61 X^Z8....9........^Z8............nents for a
stored-program compu
ffff8800385a5e78: 293128203a726574 726f6d656d206120 6961746e6f632079
746f6220676e696e 6120617461642068 7274736e6920646e 3b736e6f69746375
6320612029322820 ter: (1) a memory containing both data and
instructions; (2) a c
ffff8800385a5eb8: 0000000075636c61 00000000d863e02e ffff8800385a5ee8
0000000000000038 ffff8800385a5f68 ffffffffa00a91e8 7520676e6974616c
617061632074696e
alcu......c......^Z8....8.......h_Z8............lating unit capa
ffff8800385a5ef8: 7020666f20656c62 6e696d726f667265 612068746f622067
6974656d68746972 6f6c20646e612063 706f206c61636967 736e6f6974617265
20656874206e6f20 ble of performing both arithmetic and logical
operations on the
ffff8800385a5f38: 6e61202c61746164 2061202933282064 00000000746e6f63
00000000d863e02e ffff8800385a5f78 0000000000000037 ffff8800385a5ff8
ffffffffa00a91e8 data, and (3) a
cont......c.....x_Z8....7........_Z8............
ffff8800385a5f78: 74696e75206c6f72 65746e69206f7420 6e69207465727072
6f69746375727473 65726f747320736e 6d656d206e692064 20646e612079726f
63656e20656b616d rol unit to interpret instructions stored in memory
and make nec
ffff8800385a5fb8: 6120797261737365 202e736e6f697463 2073692073696854
63206f7320656874 00000000656c6c61 00000000d863e02e ffff8800385a6008
0000000000000036 essary actions. This is the so
calle......c......`Z8....6.......
ffff8800385a5ff8: ffff8800385a6088 .`Z8....
Call Trace:
[<ffffffff81346876>] io_serial_in+0x16 <--
[<ffffffff81346e64>] wait_for_xmitr+0x24
[<ffffffff81346f46>] serial8250_console_putchar+0x26
[<ffffffff813428de>] uart_console_write+0x3e
[<ffffffff8100bc0e>] apic_timer_interrupt+0xe
[<ffffffff813472ad>] serial8250_console_write+0xbd
[<ffffffff8106b8f5>] __call_console_drivers+0x75
[<ffffffff8106b95a>] _call_console_drivers+0x4a
[<ffffffff8106be6e>] release_console_sem+0x4e
[<ffffffff8106c628>] vprintk+0x248
[<ffffffff814fd363>] printk+0x41
-Don Slutz
Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
---
Ian.
